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Stock-Based Compensation - Summary of Stock Option Information by Exercise Price Range (Details) | 12 Months Ended
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Dec. 31, 2019 $ / shares shares
Number of options outstanding | shares | 4,078,000
Options outstanding, weighted - average remaining contractual life in years | 8 years
Options outstanding, weighted - average exercise price | $ 5.79
Number of options exercisable | shares | 847,000
Options exercisable, weighted - average exercise price | $ 5.71
Exercise Price Range One [Member] |
Exercise price, upper limit | 2.06
Exercise price, lower limit | $ 4.87
Number of options outstanding | shares | 393,000
Options outstanding, weighted - average remaining contractual life in years | 5 years
Options outstanding, weighted - average exercise price | $ 4.20
Number of options exercisable | shares | 242,000
Options exercisable, weighted - average exercise price | $ 4.10
Exercise Price Range Two [Member] |
Exercise price, upper limit | 4.88
Exercise price, lower limit | $ 5.70
Number of options outstanding | shares | 235,000
Options outstanding, weighted - average remaining contractual life in years | 5 years
Options outstanding, weighted - average exercise price | $ 5.37
Number of options exercisable | shares | 199,000
Options exercisable, weighted - average exercise price | $ 5.41
Exercise Price Range Three [Member] |
Exercise price, upper limit | 5.71
Exercise price, lower limit | $ 5.97
Number of options outstanding | shares | 1,652,000
Options outstanding, weighted - average remaining contractual life in years | 9 years
Options outstanding, weighted - average exercise price | $ 5.86
Number of options exercisable | shares | 213,000
Options exercisable, weighted - average exercise price | $ 5.81
Exercise Price Range Four [Member] |
Exercise price, upper limit | 5.98
Exercise price, lower limit | $ 6.90
Number of options outstanding | shares | 1,798,000
Options outstanding, weighted - average remaining contractual life in years | 9 years
Options outstanding, weighted - average exercise price | $ 6.11
Number of options exercisable | shares | 193,000
Options exercisable, weighted - average exercise price | $ 6.06

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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